A method and an apparatus for transmitting broadcast signals thereof are disclosed. The method for transmitting broadcast signals includes encoding PLP data; building at least one signal frame by mapping the encoded PLP data; and modulating data in the built signal frame by OFDM method and transmitting a broadcast signal having the modulated data, wherein the signal frame includes a preamble having a preamble symbol and a guard interval, wherein the guard interval is generated by using a sequence and the preamble symbol.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method of transmitting a broadcast signal, the method including: encoding Physical Layer Pipe (PLP) data; Multi Input Multi Output (MIMO) encoding the encoded PLP data; time interleaving the MIMO encoded PLP data; building at least one signal frame including the time interleaved PLP data; modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method; inserting a preamble at a beginning of each signal frame in a time domain; and transmitting the broadcast signal having the preamble and the modulated data, wherein the preamble is generated from a sequence and the sequence provides information for an emergency, and wherein the information for the emergency allows a receiver to wake up and process an emergency message.
A method for transmitting broadcast signals encodes data (PLP data), then performs MIMO encoding, and time interleaving on that encoded data. The data is then structured into signal frames. These frames have data modulated using OFDM. A preamble, generated from a sequence containing emergency information (to wake up receivers for emergency messages), is added to the beginning of each frame. Finally, the broadcast signal, containing the preamble and modulated data, is transmitted.
2. The method of claim 1 , wherein the preamble includes a guard interval.
The broadcast signal transmission method, which encodes PLP data, performs MIMO encoding and time interleaving, builds signal frames with OFDM modulation and a preamble generated from a sequence containing emergency information, further specifies that the preamble includes a guard interval. The guard interval is a time period inserted to prevent intersymbol interference and allow the receiver to synchronize.
3. The method of claim 1 , wherein the encoding PLP data further includes: Low Density Parity Check (LDPC) encoding the PLP data, bit interleaving the LDPC encoded PLP data, and mapping the bit interleaved PLP data onto constellations.
The broadcast signal transmission method's PLP data encoding process, which involves first encoding PLP data, then performing MIMO encoding and time interleaving and structuring into signal frames with OFDM modulation, further specifies the encoding of PLP data includes LDPC encoding for error correction, followed by bit interleaving to improve robustness against burst errors, and finally mapping the interleaved bits onto constellations (specific signal points) for modulation.
4. A method of receiving a broadcast signal, the method including: receiving the broadcast signal having a preamble and at least one signal frame; detecting the preamble at a beginning of each signal frame in a time domain; demodulating data in the at least one signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method; parsing the at least one signal frame including Physical Layer Pipe (PLP) data; time deinterleaving the PLP data; Multi Input Multi Output (MIMO) decoding the time deinterleaved PLP data; and decoding the MIMO decoded PLP data, wherein the preamble is generated from a sequence and the sequence provides information for an emergency, and wherein the information for the emergency allows a receiver to wake up and process an emergency message.
A method for receiving broadcast signals involves receiving a signal containing a preamble and signal frames. The preamble, generated from a sequence containing emergency information to wake up receivers, is detected at the beginning of each frame. The data in the frames is demodulated using OFDM. The frames are then parsed to extract PLP data, which undergoes time deinterleaving and MIMO decoding. Finally, the PLP data is decoded.
5. The method of claim 4 , wherein the preamble includes a guard interval.
The broadcast signal receiving method, which involves preamble detection using a sequence with emergency information, OFDM demodulation, PLP data parsing, time deinterleaving, MIMO decoding and decoding, specifies the preamble includes a guard interval. The guard interval is a time period that allows the receiver to synchronize and mitigate intersymbol interference.
6. The method of claim 4 , wherein the decoding the PLP data further includes: demapping the MIMO decoded PLP data from constellations, bit deinterleaving the demapped PLP data, and Low Density Parity Check (LDPC) decoding the bit deinterleaved PLP data.
The broadcast signal receiving method's PLP data decoding process, which comprises preamble detection using emergency information, OFDM demodulation, PLP data parsing, time deinterleaving, MIMO decoding and decoding, further specifies that the decoding of PLP data includes demapping data from constellations, deinterleaving bits to reverse the interleaving process done at transmission, and finally LDPC decoding to correct errors introduced during transmission.
7. An apparatus for transmitting a broadcast signal, the apparatus including: a processor that encodes Physical Layer Pipe (PLP) data; Multi Input Multi Output (MIMO) encodes the encoded PLP data; time interleaves the MIMO encoded PLP data; builds at least one signal frame including the time interleaved PLP data; modulates data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method; inserts a preamble at a beginning of each signal frame in a time domain; and transmits the broadcast signal having the preamble and the modulated data, wherein the preamble is generated from a sequence and the sequence provides information for an emergency, and wherein the information for the emergency allows a receiver to wake up and process an emergency message.
An apparatus (device) for transmitting broadcast signals includes a processor that encodes PLP data, performs MIMO encoding, time interleaves the data, and builds signal frames. The processor then modulates the data in the frames using OFDM. The apparatus also inserts a preamble, generated from a sequence containing emergency information (to wake up receivers for emergency messages), at the beginning of each frame and transmits the broadcast signal having the preamble and the modulated data.
8. The apparatus of claim 7 , wherein the preamble includes a guard interval.
The broadcast signal transmitting apparatus, which includes a processor to encode PLP data, perform MIMO encoding and time interleaving, build signal frames with OFDM modulation and a preamble containing emergency information, further specifies that the preamble includes a guard interval. The guard interval helps prevent intersymbol interference.
9. The apparatus of claim 7 , wherein the encoding Physical Layer Pipe (PLP) data by the processor further includes: Low Density Parity Check (LDPC) encoding the PLP data, bit interleaving the LDPC encoded PLP data, and mapping the bit interleaved PLP data onto constellations.
The broadcast signal transmitting apparatus's PLP data encoding by the processor, which performs MIMO encoding and time interleaving, builds signal frames with OFDM modulation and a preamble carrying emergency information, further specifies that the PLP data encoding process includes LDPC encoding, bit interleaving of the LDPC encoded data, and mapping the interleaved bits onto constellations.
10. An apparatus for receiving a broadcast signal, the apparatus including: a processor that receives the broadcast signal having a preamble and at least one signal frame; detects the preamble at a beginning of each signal frame in a time domain; demodulates data in the at least one signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method; parses the at least one signal frame including Physical Layer Pipe (PLP) data; time deinterleaves the PLP data; Multi Input Multi Output (MIMO) decodes the time deinterleaved PLP data; and decodes the MIMO decoded PLP data, wherein the preamble is generated from a sequence and the sequence provides information for an emergency, and wherein the information for the emergency allows a receiver to wake up and process an emergency message.
An apparatus (device) for receiving broadcast signals includes a processor that receives a broadcast signal containing a preamble and signal frames. The processor detects the preamble, which contains emergency information to wake up receivers, at the beginning of each frame. The processor then demodulates the data in the frames using OFDM, parses the frames to extract PLP data, time deinterleaves, performs MIMO decoding, and finally decodes the PLP data.
11. The apparatus of claim 10 , wherein the preamble includes a guard interval.
The broadcast signal receiving apparatus, which includes a processor to detect a preamble with emergency information, perform OFDM demodulation, parse PLP data, time deinterleave, perform MIMO decoding and decode, further specifies that the preamble includes a guard interval. The guard interval is used for synchronization and intersymbol interference mitigation.
12. The apparatus of claim 10 , wherein the decoding the PLP data by the processor further includes: demapping the MIMO decoded PLP data from constellations, bit deinterleaving the demapped PLP data, and Low Density Parity Check (LDPC) decoding the bit deinterleaved PLP data.
The broadcast signal receiving apparatus's PLP data decoding by the processor, which involves preamble detection with emergency info, OFDM demodulation, PLP data parsing, time deinterleaving, MIMO decoding and decoding, further specifies that the decoding of PLP data includes demapping data from constellations, bit deinterleaving to reverse the transmission interleaving, and LDPC decoding for error correction.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
October 3, 2016
August 15, 2017
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.